Computer systems and associated methods for controlling a user interface responsive to user engagement

A computer device comprising:

• a user interface configured to receive user input engaging with displayed player objects on the user interface;
• a memory storing computer executable code;
• and
• one or more processors which are configured to execute the computer executable code to carry out a method of controlling the user interface responsive to user engagement with the displayed player objects on the user interface, the method comprising:
• displaying on the user interface a game area having a plurality of game objects in a player graph in which the player objects have a fixed relationship to one another;
• providing on the user interface a first player object configured for targeting and shooting of said game objects in response to user input,
• and further providing on the user interface a marked location associated with an objective, the first player object being configured to respond to the user input to contribute to the objective by being selected by the user to:
• (i) travel along a player-selected trajectory to target one of the plurality of game objects in the player graph, wherein when the one of the game objects which is successfully targeted by the player object has an object characteristic matching the object characteristics of the player object and is adjacent at least one other game object sharing a matching object characteristics, the matching game object, the player object and the at least one other game object are removed from the player graph, wherein the method comprises the step of increasing a contribution to the objective when the matching game object, the player object and at least one of the game objects have been removed from the user interface following a successful targeting of the game object in the player graph;
• and
• providing on the user interface a second player object configured for targeting and shooting of same game objects in response to user input, the second player object being configured to respond to user input to
• (ii) be selected to contribute directly to the objective and be deselected from targeting the game objects in the player graph wherein the user input to select the player object to contribute to said objective comprises selecting the marked location displayed on the user interface and associated with the objective.